Patient response statistics allow the clinician to scrutinize the reliability of the hearing assessment through the responses of the patient.
The KUDUwave counts the number of times the response button is clicked during the hearing assessment. It also is able to distinguish between false and true responses. By analyzing this data, a clinician is able to make an informed decision on whether to retest the patient. By re-testing they ensure a true representation of the patient's test results.
These statistics are found on the bottom of the KUDUwave audiogram.
What is under Patient Response Statistics?
Test Re-test Reliability
The test re-test reliability is the correlation between two hearing thresholds at 1000 Hz obtained in the beginning and at the end of the test. The two thresholds should be within 10 dB of each other. Indicating reliability and consistency with the patient responses. In simple terms, a patient will respond at 10 dB at 1000 Hz, and when tested again later, at the same frequency the patient will respond at 10 dB. It would be highly suspicious if the patient was to respond at completely different thresholds at the same frequency (1000 Hz). Therefore, the test retest reliability on the audiogram should not be more than 10 dB.
False Positive Response
False positive response indicates the amount of times the patient pressed the response button while a tone was not presented. This is indicated as a percentage. Generally, a high false positive response percentage is yielded if a patient is malingering or if the conditioning was not comprehensive. The false positive response should not be more than 10%. At times, even with a false positive response of more than 10%, a good clinical explanation or motivation of the reliability of the patient responses may suffice.
The standard deviation is a calculation which monitors how quickly a patient is to respond to a tone. That is, if a patient's response time to the tone deviates more than 300 milliseconds, they could be cheating the test and getting away with it. If the standard deviation result is greater than 300, it will be highlighted in orange and you should re-test the patient.
How to know when to re-test?
The rule-of-thumb is 10.
If the test re-test reliability score or the false positive response percentage is greater than 10, it will be highlighted in orange and you should re-test the patient.
Anything orange = a problem.
Any results which lie out of range, will be indicated in orange and it is recommended that the patient is re-tested.